The calcium wave that prevents polyspermy also causes ________.
A. mitosis to occur
B. the secondary oocyte to finish meiosis II
C. the sperm to lose its tail
D. All of the choices are correct.
Answer: B
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It is impossible for sperm to be functional (able to fertilize the egg) until after ________
A) the tail disappears B) they have been stored in the uterus for several days C) they become spermatids D) they undergo capacitation
Which of the following statements is true?
A. When the pressure in the lung is greater than inside the body, air flows from the body until the pulmonary and atmospheric pressures are equal. B. When the pressure in the lung is greater than outside the body, air flows from the body until the pulmonary and atmospheric pressures are equal. C. When the pressure in the lung is greater than outside the body, air flows into the body until the pulmonary and atmospheric pressures are equal. D. When the pressure in the lung is less than outside the body, air flows from the body until the pulmonary and atmospheric pressures are equal.
What is the correct sequence for lacrimal fluid production and drainage?a: Tears disperse across the surface of the eye.b: Tears are produced by the lacrimal gland.c: Fluid drains through the nasolacrimal duct.d: Fluid enters the nasal cavity.e: Fluid enters the lacrimal canaliculi and collects in the lacrimal sac.
A. b, a, e, c, d B. b, a, c, d, e C. a, b, c, d, e D. c, a, d, b, e E. c, a, b, e, d
Micturition
a. is the process of emptying the bladder b. is a parasympathetic reflex c. is initiated when stretch receptors in the bladder wall are excited d. requires a relaxed external urethral sphincter e. has all of the above characteristics